Pair of wheeled skate-skis usable on most terrains

ABSTRACT

A pair of wheeled skate-skis comprising a chassis with two upwardly projecting forked ends, a flexible foot strap attached to a front side of the chassis, a front buckle slide fastened to an opposite front side of the chassis, two buckle slides, an adjustable binding, a front wheel assembly and a rear wheel assembly. To secure a shoe in position, the flexible foot strap is wound around the shoe and through the front and rear buckle slides and folded back to be fixed to itself by a hook-and-loop fastener. The upwardly projecting forked ends of the chassis have a plurality of axle-receiving holes for mounting wheels of various sizes and types. The chassis can be made by injection molding or compression molding or by cutting a section of fiberglass I-beam.

CROSS REFERENCE TO RELATED APPLICATIONS

This application concerns improvements to a pair of wheeled skate-skiswith brakes usable on most terrains made and used by applicant PatrickG. Gates, who is the patentee of related U.S. Pat. Nos. 4,943,075,5,251,934, and 6,592,129. The information set forth in these patentspertains to his earlier pairs of wheeled skate-skis with brakes usableon most terrains. The information in these patents is incorporated intothis application by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to wheeled skate-skis and moreparticularly to wheeled skate-skis with a one-piece foot strap forstrapping down the shoes of the skate-ski user and a new chassis designallowing wheels of various sizes to be mounted on the chassis so thatthe skate-skis can be used on most terrains.

2. Description of the Related Art

In some similar respects to using side by side water skis and snow skis,side by side wheeled skis have been and are being used for travel overland. In 1973, Robert A. Peterson, in his U.S. Pat. No. 3,767,220illustrated and described his two-wheeled vehicle for rollablysupporting one foot of a person, as a like two-wheeled vehicle supportedthe person's other foot. The person, in a standup position, thenmaneuvered like he or she would snow-ski on a slope. Each vehicle had aframe supporting a pair of wheels at opposite ends and shaped so theperson's feet are located close to ground level. Toe and heel clampsheld the person's respective boots in position on the respectivetwo-wheeled vehicles. A movable calf member was pivotally connected toeach heel clamp, and it had a braking portion to be moved into brakingcontact with the inflated rear tire when the person altered his or herposition to move his or her calf to thereby apply the brakes.

Also in 1973, John G. Nicolson, in his U.S. Pat. No. 3,749,413,illustrated and described his wheeled ski. Two of them side by side wereused by a person when skiing over dry land using motions similar to snowskiing.

Earlier in 1966, Duane E. Blanchard, in his U.S. Pat. No. 3,365,208,illustrated and described his roller skis, one to be used on each footas the person's shoes were respectively held in place by a cable-likebinding on each roller ski. His roller skis were said to provide theskier with a high degree of maneuverability similar to using snow skison snow. However, Duane E. Blanchard's roller skis had no brakes. JohnTkaczyk, in U.S. Pat. No. 5,286,043 (1994), described a set of rollerskates having a foot platform suspended between the front and rearwheels for increased stability. The invention also featured aretractable third wheel between the two main wheels and a means foradjusting the foot platform to accommodate shoes of different sizes.

Later, that same year, U.S. Pat. No. 5,312,120 was issued to GeorgWiegner. Wiegner's invention described a roller-ski having a front and arear wheels that essentially are capable of moving back and forthlaterally along their respective axles during use in order to provideincreased maneuverability.

Then, in 1995, John Tkaczyk was issued another U.S. Pat. No. 5,398,950,for an “Interchangeable Roller Skate”. This invention is related to (adivision of) his 1994 U.S. Pat. No. 5,286,043 patent mentioned above.

In 1999, U.S. Pat. No. 5,901,981 was awarded to Douglas Lucht, whodescribed a roller-ski and brake apparatus primarily intended tosimulate skiing on snow. The invention uses a plurality of in-linewheels that are mounted on a longitudinally flexible chassis member insuch a way as to simulate the flexing nature of a real snow ski.

U.S. Pat. No. 6,116,619 was issued to Chuan-Fu Kao and Chi-Chun Chiu in2000 for a “Sole Plate Structure with Shock Absorbing Effects for RollerSkates”. This invention utilizes a chassis that consists of at least twopieces, one rigidly connected to the front wheel and the other to theback wheel. The two pieces are hinged together with a spring to providedamping so that the front and back wheels are capable of verticalmovement with respect to each other.

In 1990, Patrick G. Gates, in his U.S. Pat. No. 4,943,075, illustratedand described his pair of wheeled skate-skis with brakes usable on mostterrains. Then in 1993, in his U.S. Pat. No. 5,251,934, he illustratedand described his improved pair of wheeled skate-skis with brakes usableon most terrains. Using a pair of these wheeled skate-skis with brakeswhile having his or her athletic shoes on, having his or her feet wellheld in surrounding bindings, and having convenient hand controls tooperate the brakes, a person is able to travel on most terrains underbetter control. Most recently, in his U.S. Pat. No. 6,592,129, Mr. Gatesillustrated and described a further improved pair of wheeled skate-skiswith brakes usable on most terrains having higher performancehand-and-fingers-operated hydraulic brakes, an improved chassisproviding a spring-like suspension and lower center of gravity,adjustable bindings comprised of a firm outer shell and a soft innerliner, and a removable mud flap.

The growing popularity of wheeled skate-skis and especially the factthat persons are now using them in more and more applications haveincreased the demand for a pair of skate-skis that are adaptable to avariety of situations and types of terrains. This versatility is mosteasily provided by changing the diameter, width, tread, and material ofthe wheels (in the latter case, for example, a switch from polyurethanewheels to pneumatic tires may be desirable). What is needed, then, is apair of wheeled skate-skis that can be easily and quickly retrofitted inthe field with different types of wheels. The spare wheels could, forexample, be kept handy in the user's backpack. Previously existingskate-skies had wheel forks with fixed-position axle holes. To mount asmaller-size wheel would lead to a situation in which the bottom surfaceof the chassis might come unacceptably close to the ground or might evenscrape the ground. A larger wheel, on the other hand, might not bemountable at all because there may not be enough clearance in the fork.Also, mounting a larger wheel in fixed-position axle holes leads to asituation in which the chassis (and therefore the center of gravity) israised above the ground, causing potential stability problems to arise.

The applicant has provided a solution to these problems by creating awheel fork angled upward that has holes placed therein at certainintervals such that the bottom of the chassis can be kept essentially atthe same height above ground, regardless of the size of the wheelsmounted. Larger wheels are mounted in the axle holes that are outboardand upward, whereas smaller wheels are progressively mounted in axleholes that are located inboard and lower. This arrangement also providesthe proper amount of clearance between the outer edge of the varioussizes of wheels and the chassis.

One of the main advantages of the present invention is that the centerof gravity of the skate-skis, equipped with any of the various wheelsthat may be adapted to it, is lower than the center of gravity of allother skate-skis in this class, whether or not they have interchangeablewheels.

The substantial increase in the use of wheeled skate-skis has also leadto a considerable amount of user feedback as to the shortcomings of themechanisms used to secure the user's foot or shoe to the chassis of theskate-ski. In many cases, users have found that their feet or shoes comeloose prematurely from the skate-skis' bindings or that their feet orshoes shift to an uncomfortable position during an outing.

Through a substantial amount of research and testing, the applicant hascome up with a solution that is as effective as it is deceptivelysimple. He has devised a single strap to secure the toe and frontportion of the user's foot to the chassis. One end of this strap isaffixed to the chassis, outboard of the user's toe, at a particularangle that is very critical and was ascertained through muchexperimentation. However, a benefit of affixing the outboard end of thestrap at this critical angle is that it allows the strap to be woundaround the front part of the user's foot, starting at the toe and movingbackwards towards the ankle, in such a way that the strap binds the footto the chassis in a very natural, comfortable—and mostimportantly—stable fashion. Moreover, the applicant discovered that thesame anchor point angle is ideal for all sizes of shoes. Therefore, theanchor point angle does not have to be adjusted; however, means areprovided to mode the anchor point laterally inboard and outboard toaccommodate different sizes of shoes. The inboard end of the strap,after being wound around the foot one or more times, is affixed toitself on its final winding by means of a hook-and-loop fastener. Thehook type material is placed on one side of the strap and the loopmaterial on the other side. By this means the bottom side of the inboardend of the strap can be affixed to the top side of the immediatelypreceding strap winding.

A third issue that the applicant identified as a shortcoming of existingwheeled skate-skis is that the straps used to secure the upper part ofthe foot to the bindings will often form an angle, or “jackknife,” atthe point where they are joined together with a buckle. This often leadsto a situation in which the upper part of the foot becomes loose fromthe binding, leading to discomfort and lack of control for the user.This invention provides guide flanges on the buckles to prevent thestraps from coming out of linear alignment with each other.

BRIEF SUMMARY OF THE INVENTION

The wheeled skate-skis according to the present invention comprises: achassis with upwardly projected forked ends; an adjustable binding forbinding the wearer's foot; a flexible foot strap, a front buckle slide,and two rear buckle slides for strapping down the wearer's foot to thechassis; a front wheel assembly; a rear wheel assembly; and ahand-and-fingers-operated hydraulic braking system. The chassis has afoot-receiving body portion and two forked ends angled upward withaxle-receiving holes disposed therein at certain intervals such thatwheels of different sizes can be mounted using the axle-receiving holes.Larger wheels can be mounted using the axle-receiving holes that arefurther out and vertically higher, whereas smaller wheels can beprogressively mounted using the axle-receiving holes that are further inand vertically lower. This arrangement provides a proper amount ofclearance between the outer edge of the various sizes of wheels and thechassis and also allows the wheeled skate-skis to have adequate groundclearance while maintaining a low center of gravity for wheels of manydifferent sizes.

One end of the flexible foot strap is affixed to one side (i.e. thefirst side) of the chassis at a particular angle that is very criticaland was ascertained through much experimentation. This angle allows thefoot strap to be easily wound across the front portion of the user'sfoot and through a front buckle slide attached to the other side (i.e.the second side) of the chassis. The foot strap is then tightly woundbackwards towards the ankle and through a rear buckle slide attached tothe first side of the chassis, then across the foot and through anotherrear buckle slide attached to the second side of the chassis, and thentightly folded back to be affixed to the foot strap itself. This way thefoot strap binds the foot to the chassis in a natural, comfortable andstable fashion.

The adjustable binding comprises an outer layer of firm material and aninner liner of soft of softly padded material. When the wheeledskate-skis are in use, both the outer layer and the inner liner of theadjustable binding are kept in position with fasteners. To prevent thefasteners of the outer shell of the adjustable binding from going out ofproper alignment, guide flanges are provided on one of two overlappingportions of the outer shell for guiding and receiving the otheroverlapping portion to keep the two overlapping portions in properalignment.

Furthermore, the hand-and-fingers-operated hydraulic braking system forthe wheeled skate-skis is improved from the one disclosed in one of theapplicant's earlier patents to allow the brake fluid to bleed moreeasily.

Due to the particular structure of the chassis of the present invention,the chassis can be cut from a section of commercially availablefiberglass I-beam at a relatively low cost compared to chassis made byother methods such as injection molding or compression molding.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a pair of wheeled skate-skisaccording to the present invention.

FIG. 2 shows a perspective view of the chassis of the wheeled skate-skisaccording to the present invention; it also illustrates how a shapecorresponding to the chassis of the present invention can be cut from asection of I-beam.

FIG. 3 shows the flexible foot strap wound through the front buckleslide over the toe of the shoe of the skate-ski user according to thepresent invention.

FIG. 4 shows the flexible foot strap wound through the buckle slide onthe first side of the chassis, following the step shown in FIG. 3.

FIG. 5 shows the flexible foot strap wound through the buckle slide onthe second side of the chassis and ready to be folded back to be fixedto itself with a hook-and-loop fastener.

FIG. 6 shows the flexible foot strap folded back and fixed to itselfwith a hook-and-loop fastener.

FIG. 7 shows the second side of the chassis and the flexible foot strapwound through the front buckle slide and the rear buckle slide on thesecond side of the chassis according to the present invention.

FIG. 8 shows that at the end where the flexible foot strap is fastened(or anchored) to the first side of the chassis, the flexible foot strapis inclined relative to a vertical line to the foot-receiving bodyportion of the chassis.

FIG. 9 shows that because of the way the foot is strapped to the chassisaccording to the present invention, some flexibility is allowed for theupward-forward movement of the heel of the foot.

FIG. 10 shows a top plan view of the chassis with the front wheelassembly and the rear wheel assembly according to the present invention.

FIG. 11 and FIG. 12 show that the chassis of the wheeled skate-ski ofthe present invention can be installed with wheels of various sizes.

DETAILED DESCRIPTION OF THE INVENTION

The preferred embodiment of the pair of wheeled skate-skis 10 of thepresent invention is shown in FIG. 1. Each wheeled skate-ski 10comprises a chassis, separately shown in FIG. 2, an adjustable binding14, two rear buckle slides 16, a flexible foot strap 18, a front buckleslide 20, a front wheel assembly 40 and a rear wheel assembly 46.

The chassis is separately shown in FIG. 2. It has a foot-receiving bodyportion 123, a front forked end 124 and a rear forked end 126, whereineach of the forked ends 124,126 has two prongs 128, and each of theprongs 128 has a plurality of axle-receiving holes 130 disposed atcertain intervals. Furthermore, the front forked end 124 and the rearforked end 126 of the chassis are upwardly projected relative to thefoot-receiving body portion 123 with the plurality of axle-receivingholes 130 of each prong 128 aligned in a substantially straight lineforming an angle with the foot-receiving body portion 123 of thechassis. The angle between the substantially straight line of theaxle-receiving holes 130 and the foot-receiving body portion 123 of thechassis is preferably between 30° and 60°, and more preferably between40° and 50°. The chassis further has a first side 121 and a second side122, on each of which are disposed at least one rear fastening hole 125and a plurality of front fastening holes 127. Each prong 128 of the rearforked end 126 is further provided with two brake fastening holes 132,preferably above the line of the axle-receiving holes 130, for fasteningbrakes.

Referring to FIGS. 1 and 3˜6, the adjustable binding 14 has two bottomportions 143 respectively fastened to the first side 121 of the chassisand the second side 122 of the chassis, each using a rear fastening hole125. The adjustable binding 14 further comprises an outer shell 141 offirm material and an inner liner 142 of soft or softly padded materialinside the outer shell 141. The outer shell 141 has spaced holes andcutouts so that it is sufficiently flexible and adjustable to fit aperson's shoe; the outer shell 141 has fasteners 144 to keep the outershell 141 in position when the wheeled skate-ski 10 is in use. As anexample, the fasteners 144 for the outer shell 141 may each be a ratchetbuckle with a strap as shown in FIGS. 1 and 3˜6. The inner liner 142 hasa cutout and two overlapping portions, so it is adjustable to fit aperson's shoe; the inner liner 142 has a fastener to keep theoverlapping portions in position when the wheeled skate-ski 10 is inuse. As an example, the fastener of the two overlapping portions of theinner liner 142 may be a hook-and-loop fastener, commonly known as aVelcro® fastener.

As shown in FIG. 3, the outer shell 141 of the adjustable binding 14 hastwo pairs of matching overlapping portions 150,151 across and over thewearer's foot, the overlapping portion 150 has two guide flanges 154respectively disposed at positions corresponding to the upper edge andthe lower edge of the other overlapping portion 151 so that the twooverlapping portions 150,151 can be kept in alignment with each otherwhen the wheeled skate-ski 10 is in use. In the embodiment shown, thefastener 144 for the outer shell 141 consists of a ratchet buckleattached to the overlapping portion 151 and a strap attached to theoverlapping portion 150. However, the positions of the ratchet buckleand the strap of the fastener 144 can be reversed. Preferably the guideflanges 154 and the overlapping portion 150 are integrally molded in onepiece. One fastener 144 of the outer shell 141 is disposed over eachpair of matching overlapping portions 150,151 between the two guideflanges 154. Though two pairs of matching overlapping portions 150,151are shown in FIG. 3, a different number of pairs of matching overlappingportions 150,151 can be used.

Two rear buckle slides 16 are fastened to the chassis, one to the firstside 121 and the other to the second side 122 of the chassis atcorresponding locations across the foot-receiving body portion 123 ofthe chassis. Each of the rear buckle slides 16 is fastened to thechassis using a rear fastening hole 125. A front buckle slide 20 isfastened to the second side 122 of the chassis using a front fasteninghole 127. Further, a long, sturdy, flexible foot strap 18 is fastened atone end to the first side 121 of the chassis, across the foot-receivingbody portion 123 from the front buckle slide 20 on the second side 122of the chassis using a pair of the front fastening holes 127. Referringto FIGS. 3˜6, a shoe worn by a person can be securely bound in theadjustable binding 14 and strapped down to the foot-receiving bodyportion 123 of the chassis by tightly winding the flexible foot strap 18sequentially across the front portion of the foot, through the frontbuckle slide 20 on the second side 122 of the chassis (see FIG. 3),rearward across the foot, through the rear buckle slide 16 on the firstside 121 of the chassis (see FIG. 4), and through the rear buckle slide16 on the second side 122 of the chassis (see FIGS. 5 and 7); thentightly folding the flexible foot strap 18 back onto itself between thetwo rear buckle slides 16; and finally fixing the flexible foot strap 18in position (see FIG. 6). The flexible foot strap 18 can be affixed toitself with a hook-and-loop fastener. For example, as shown in FIG. 5,the hook type surface is placed on an end portion of the flexible footstrap 18 and the loop surface on a corresponding portion of the flexiblefoot strap 18. FIG. 7 illustrates a side view of the skate-ski 10 with ashoe securely strapped in position by the flexible foot strap 18 in themanner described above.

As shown in FIG. 8, the end of the flexible foot strap 18 affixed to thefirst side 121 of the chassis is inclined at an angle θ from a verticalline to the foot-receiving body portion 123 of the chassis. The angle θis preferably between 10° and 20°. To fix the angle, it is preferablefor the flexible foot strap 18 to be fastened to the first side 121 ofthe chassis using at least two front fastening holes 127 as shown in thevarious figures. It was discovered by the inventor that the same rangeof values for θ works well for most shoe sizes. Therefore, the angledoes not have to be adjusted. Further, additional front fastening holes127 are provided on the first side 121 of the chassis to allow theanchor point of the flexible foot strap 18 to be moved laterally forwardor backward to accommodate different shoe sizes.

Each of the buckle slides 20 and 16 needs only one buckle hole for theflexible foot strap 18 to pass through, although other types of buckleslides or adapters, such as the two-hole buckle slide (with a cross barbetween the two holes) as shown in FIGS. 3˜9, can also be used.Depending upon the shoe sizes and the desired tightness of the flexiblefoot strap 18, the user may want to wind the flexible foot strap 18through different holes of the buckle slides 20 and 16. Namely, extraholes of the buckle slides provide extra flexibility in using theskate-ski 10.

For the purpose of strapping down the flexible foot strap 18, the firstside is preferably the outer side, i.e. the right-hand side for theright wheeled skate-ski 10 and the left-hand side for the left wheeledskate-ski 10.

As shown in FIGS. 7 and 8, the two bottom portions 143 of the adjustablebinding 14 and the two rear buckle slides 16 are fastened together tothe respective side 121,122 of the chassis using the same fastenersthrough the rear fastening holes 125. However, the bottom portions 143of the adjustable binding 14 and the rear buckle slides 16 can certainlybe separately fastened to the respective sides 121,122 of the chassis.

As illustrated in FIGS. 8 and 9, the particular embodiment disclosed inthis invention allows the heels of the user of the wheeled skate-skis 10to move above and away from the foot-receiving body portion 123 of thechassis, thus providing an increased flexibility in the user's movement.

The front wheel assembly 40 and the rear wheel assembly 46 areessentially the same as those described in the U.S. Pat. No. 6,592,129('129 patent), particularly FIGS. 3˜6 thereof. Briefly, as shown inFIGS. 6 and 10, the front wheel assembly 40 has a wheel 50, a tire 110and an axle 86, positioned on the front forked end 124 of the chassisusing a pair of fasteners 90 and axle-receiving holes 130, one on eachprong 128 of the front forked end 124. Similarly, the rear wheelassembly 46 has a wheel 50, a tire 110 and an axle 86, positioned on therear forked end 126 of the chassis using a pair of fasteners 90 andaxle-receiving holes 130, one on each prong 128 of the rear forked end126. The tires can be pneumatic tires or solid plastic tires made ofpolyurethane (PU) or other plastics.

The pair of wheeled skate-skis 10 can further include a hydraulicbraking system as described in the '129 patent. The '129 patent isincorporated herein by reference as far as the details of the hydraulicbraking system are concerned. An improvement to the hydraulic brakingsystem described therein is provided here, which allows bleeding of thebraking fluid in the hydraulic braking system of the '129 patent.Referring to FIGS. 6 and 7 of the '129 patent, a hole can be drilledthrough the extended end of the fitting 64 of the brake cylinderassembly 66 into the fluid passageway 65 of the fitting 64; normally,the hole will be sealed by a brake fluid bleed tap, which is removableto allow bleeding of the brake fluid inside the hydraulic brakingsystem. As an example, the hole at the extended end of the fitting 64may be a threaded hole and the brake fluid bleed tap a matching screw.To bleed the brake fluid, the user simply loosens the screw and removesthe brake fluid from the hydraulic braking system.

The manufacture of the chassis will be described below. The chassis canbe made by compression molding or injection molding from variousthermoset resins or thermoplastic resins. Alternatively, as illustratedin FIG. 2, the chassis can be formed by cutting a predetermined shapefrom a fiberglass I-beam section. The I-beam section has two flanges anda web connecting the two flanges. The flanges are cut so that in themiddle portion of the I-beam section they are flush with one side of theweb, forming the foot-receiving body portion 123 of the chassis. At eachend of the I-beam section, the flanges are cut in such as way as to formtwo broader prongs 128 curving upwards at an angle. A plurality ofaxle-receiving holes 130 and the brake fastening holes 132 are thendrilled through each prong 128 at corresponding locations so that theaxle-receiving holes 130 on one flange are in alignment with those onthe other flange as described above. Water jet technology can be used tocut the chassis of the present application from a fiberglass I-beamsection.

Another important feature of the skate-ski 10 according to the presentinvention is that it can be used with a wide range of wheel sizes. Thehigher, outer holes on the prongs 128 allow wheels of larger diametersto be installed. Note that as illustrated in FIG. 10, the ends of thefoot-receiving body portion 123 of the chassis must be sufficientlyrecessed inwards relative to the forked ends 124, 126 to accommodatewheels 50 and tires 110 of different sizes installed on the prongs 128.However, excess recessing of the foot-receiving body portion 123 maycompromise the structural integrity of the chassis. In general, wheelswith tires of the diameter from 100 mm to 200 mm (i.e. 4″ to 8″) arefound to be suitable for the wheeled skate-skis 10 of the presentinvention in terms of comfort and stability, as illustrated in FIGS. 11and 12. For example, in a preferred embodiment of the present invention,four axle-receiving holes 130 are provided on each prong 128 of thefront and rear forked ends 124,126, such that wheels with 7″ or 8″pneumatic tires can be mounted at the highest axle-receiving holes 130,wheels with 6″ pneumatic tires or 145 mm polyurethane (PU) tires can bemounted at the second highest axle-receiving holes 130, wheels with 5″pneumatic tires or 120 or 125 mm PU tires can be mounted at the secondlowest axle-receiving holes 130, and wheels with 100 or 110 mm PU tirescan be mounted at the lowest axle-receiving holes 130.

1. A pair of wheeled skate-skis for use on most terrains, each wheeledskate-ski comprising: a chassis having a foot-receiving body portion, afront forked end, a rear forked end, each forked end having two prongs,each prong having a plurality of axle-receiving holes; an adjustablebinding with two bottom portions respectively fastened to a first sideof the chassis and a second side of the chassis; two rear buckle slides,one fastened to the first side and the other fastened to the second sideof the chassis; a front buckle slide fastened to the second side of thechassis; a flexible foot strap with one end fastened to the first sideof the chassis opposite to the front buckle slide; a front wheelassembly having a wheel, a tire and an axle, mounted on the front forkedend of the chassis using a pair of fasteners and axle-receiving holes,one on each prong of the front forked end; and a rear wheel assemblyhaving a wheel, a tire and an axle, mounted on the rear forked end ofthe chassis using a pair of fasteners and axle-receiving holes, one oneach prong of the rear forked end, whereby a shoe worn by a user of thewheeled skate-ski can be securely bound in the adjustable binding andstrapped down to the foot-receiving body portion of the chassis bytightly winding the flexible foot strap sequentially through the frontbuckle slide on the second side of the chassis, the rear buckle slide onthe first side of the chassis, and the rear buckle slide on the secondside of the chassis, then folding the flexible foot strap back ontoitself to be fixed in position.
 2. A pair of wheeled skate-skis for useon most terrains, as claimed in claim 1, wherein the front forked endand the rear forked end of the chassis of each wheeled skate-ski areupwardly projected with the plurality of axle-receiving holes of eachprong aligned in a substantially straight line forming an angle with thefoot-receiving body portion of the chassis.
 3. A pair of wheeledskate-skis for use on most terrains, as claimed in claim 2, wherein theangle between the substantially straight line of the axle-receivingholes and the foot-receiving body portion of the chassis is between 30°and 60°.
 4. A pair of wheeled skate-skis for use on most terrains, asclaimed in claim 3, wherein the adjustable binding of each wheeledskate-ski comprises: an outer shell of firm material, having spacedholes and cutouts, so the outer shell is adjustable to fit the user'sshoe, and having fasteners to keep the outer shell in position when thewheeled skate-ski is in use; and an inner liner of soft material insidethe outer shell, having a cutout and two overlapping portions, so theinner liner is adjustable to fit the user's shoe, and having a fastenerto keep the overlapping portions in position when the wheeled skate-skiis in use.
 5. A pair of wheeled skate-skis for use on most terrains, asclaimed in claim 4, wherein the fasteners of the outer shell of theadjustable binding are each a ratchet buckle and a strap.
 6. A pair ofwheeled skate-skis for use on most terrains, as claimed in claim 4,wherein the fastener of the two overlapping portions of the inner linerof the adjustable binding is a hook-and-loop fastener.
 7. A pair ofwheeled skate-skis for use on most terrains, as claimed in claim 4,wherein the outer shell of the adjustable binding has two overlappingportions; and the fasteners of the outer shell of the adjustable bindingare fastened over the two overlapping portions of the outer shell,wherein one or more pairs of guide flanges are disposed on one of theoverlapping portions for guiding and receiving the other overlappingportion in order to keep the two overlapping portions in alignment witheach other when the wheeled skate-ski is in use.
 8. A pair of wheeledskate-skis for use on most terrains, as claimed in claim 4, wherein thetwo bottom portions of the adjustable binding and the two rear buckleslides of each wheeled skate-ski are fastened together at the respectiveside of the chassis.
 9. A pair of wheeled skate-skis for use on mostterrains, as claimed in claim 3, wherein the angle between thesubstantially straight line of the axle-receiving holes and thefoot-receiving body portion of the chassis is between 40° and 50°.
 10. Apair of wheeled skate-skis for use on most terrains, as claimed in claim3, wherein the end of the flexible foot strap fastened to the first sideof the chassis is inclined at an angle from a vertical line to thefoot-receiving body portion of the chassis.
 11. A pair of wheeledskate-skis for use on most terrains, as claimed in claim 10, wherein theangle between the end of the flexible foot strap fastened to the firstside of the chassis and a vertical line to the foot-receiving bodyportion of the chassis is between 10° and 20°.
 12. A pair of wheeledskate-skis for use on most terrains, as claimed in claim 3, wherein thefirst side of the chassis of each wheeled skate-ski has a plurality offront fastening holes for fastening the flexible foot strap to the firstside of the chassis; and the second side of the chassis has a pluralityof front fastening holes for fastening the front buckle slide to thesecond side of the chassis.
 13. A pair of wheeled skate-skis for use onmost terrains, as claimed in claim 3, wherein the chassis of eachwheeled skate-ski is obtained by cutting a shape corresponding to thechassis from a section of I-beam.
 14. A pair of wheeled skate-skis foruse on most terrains, as claimed in claim 13, wherein the chassis ofeach wheeled skate-ski is cut by water jet technology.
 15. A pair ofwheeled skate-skis for use on most terrains, as claimed in claim 3,wherein the chassis of each wheeled skate-ski is made by injectionmolding or compression molding.
 16. A pair of wheeled skate-skis for useon most terrains, as claimed in claim 3, wherein the chassis of eachwheeled skate-ski is capable of receiving tires with diameters from 100mm to 200 mm.
 17. A pair of wheeled skate-skis for use on most terrains,as claimed in claim 16, wherein the outermost pairs of theaxle-receiving holes are used for tires with diameters from about 175 mmto 200 mm.